Device for truing crank-shafts of engines



H. G. KUPER.

DEVICE FOR TRUING CRANK SHAFTS 0F ENGINE-IS. APPLICATION FILED 1AN.29| 1919.

1,378,799. Patented Maj 17,1921.

UNITED STATES PATENT OFFICE.

HENRY G. KUIPER, OI COLUMBUS, NEBRASKA.

DEVICE FOR TRU'ING CRANK-SHAFTS Oi ENGINES.

Specification of Letters Patent.

Patented Ma 17,1921.

Application filed January 29, 1919. Serial No. 273,778.

To all whom it may concern:

Be it known that I, HENRY G. KUPER, a citizen of the United States, residin at Columbus in the county of Platte and tate of Nebraska, have invented certain new and useful Improvements in Devices for Truing Crank-Shafts of Engines; and I do hereby can be trued when worn irregular without removing the crank shaft from the engine.

Another object of this invention is the provision of means adapted to form the lower half of a bearing of a connecting rod and is equip ed with a .cutting or shaving blade that Wlll remove the irregular surface of the bearing engaging ortions on rotating the crank shaft manual y.

A further object of this invention is the provision of means for adjusting the blade v or knife so that its cutting or shaving capacity can be varied thus permittin of the device being used on crank shafts o different diameters and also where the bearing engaging portions vary according to their irregular surfaces.

A still further object of this invention is the provision of a device for truing crank shafts of engines of the above stated character, which shall be simple, durable and eflicient, and which may be manufactured and sold at a comparatively low cost.

With these and other objects in view as will become more, apparent as the description proceeds, the invention consists in certain novel features of construction, combi nation and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the followin ings, in whic Figure 1 tional view illustrating my invention applied to the crank shaft and the connecting rod thereof, I r

Fig. 2 is'a perspective view of the domes description and accompanying drawis a fragmentary vertical secfor truing crank shafts of engines and which is constructed in accordance with my invention, and

same.

Referring in detail to the drawing, the numeral 1 indicates as ail-entirety an engine including the usual crank case 2, and crank shaft 3 having connected to its crank port1on 4 a connectingrod 5; In Fig. 1 'I have elected to show my invention applied to one of the connecting. rods 5 and in order to apply the same, the crank case 2 is dropped or removed from the base of the engine exposing the crank shaft and its various connecting rods.

In applying my invention to'the crank portion w ich is desired to be trued or removed of its irregular surfaces, the lower half of-the bearing of the respective connectlng rod is removed and my invention applied to the upper half and about the crank portion of said crank shaft. The body 6 has formed thereon arcuate shaped extensions 7 that receive approximately onehalf of the bearing engaging portion of the crank shaft and is provided with oppositely disposed ears 8 to'receive the bolts of the connecting rodJS, whereby the body is socuredin position. The body 6 is rovided with'a slot 9' that has its upper e ge open through the extension 7 and slidably receives a knife or blade 10. This knife or blade has its upper edge provided with a cutting face 11 adapted to engage the bearing engaging portions of the crank shaft. The blade or knife 10 is held within the slot 9 Fig. 3 is a transverse sectional view of the by means of set screws 12 carried by the '1 -body.6. Adjusting screws 13 are mounted. in the body and engage the lower edge of the connecting rod the knife or blade removes the irregular surface of the bearing engagingportion of the crank shaft, thus it will be seen that the bearing engaging portions of the crank shaft can be rea 1y trued without engine.

removing the crank shaft fromthej:

While I have shown and described the preferred embodiment of my invention, it Willbe understood that minor changes in construction, combination, and arrangement of parts may be made Without departing from the spirit and scope of the invention as claimed.

Having thus described my invention What I claim is l. A device for truing crank shafts including a connecting rod and its integral bearing section receiving one-half of thebearing portion of a crank shaft, a body, arcuate-shaped extensions formed on sald body and detachably secured to the bearing sectlon, and a knife carried by said body and adapted to shave the face of the bearing portion on rotation of the crank shaft. 2. A device for truing crank shafts including a connecting rod and its integral bearing section receiving one-half of the bearing portion of a crank shaft, a body of the same length as the integral bearing section, and a knife carried by said body and adapted to shave the face of the bearing portion on rotation of the crank shaft.

In testimony whereof I afiix my signature in presence of tWo Witnesses.

HENRY G. KUPER.

Witnesses:

GUS. G. BEoHER, JR., H. F. J. HooKENBERGEm 

